640219935 has 16 divisors (see below), whose sum is σ = 1027653120. Its totient is φ = 340350240.

The previous prime is 640219933. The next prime is 640219963. The reversal of 640219935 is 539912046.

It is not a de Polignac number, because 640219935 - 2¹ = 640219933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640219893 and 640219902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640219933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63955 + ... + 73284.

It is an arithmetic number, because the mean of its divisors is an integer number (64228320).

Almost surely, 2^640219935 is an apocalyptic number.

640219935 is a deficient number, since it is larger than the sum of its proper divisors (387433185).

640219935 is a wasteful number, since it uses less digits than its factorization.

640219935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137558.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 640219935 is about 25302.5677550718. The cubic root of 640219935 is about 861.8725804557.

The spelling of 640219935 in words is "six hundred forty million, two hundred nineteen thousand, nine hundred thirty-five".